Air shower room

1. Introduction:

Air shower room (AIR SHOWER) is also known as air shower, clean air shower room, clean air shower room, air shower room, blowing room, air shower door, bath dust room, blowing shower room, air shower channel and air blowing shower room.

The air shower room is a necessary channel to enter the clean room, which can reduce the pollution problems caused by entering and leaving the clean room.

The air shower room is a kind of local purification equipment with strong versatility, which is installed between clean room and non-clean room. When people and goods want to enter the clean area, they need to be showered by the air shower room. The clean air blown out can remove the dust carried by people and goods, and can effectively block or reduce the dust source entering the clean area. The front and rear doors of the air shower room/cargo shower room are electronically interlocked, which can also act as an air lock to prevent unpurified air from entering the clean area.

2. development trend:

The intelligent voice air shower room is equipped with a voice prompt system. When blowing, the automatic voice system prompts people to complete the whole blowing and dust removal process in an orderly manner to achieve effective purification effect. The clean air flow filtered by the filter is sprayed to the body from all directions by a rotatable nozzle to effectively and quickly remove dust particles. The cleaned dust particles are then filtered by the primary filter and recirculated to the air shower area.

Intelligent voice features: automatic control, electronic interlock, double door lock when blowing shower, infrared induction automatic blowing shower. Stainless steel semi-glass door automatic door closer, transparent window, inner low plate made of stainless steel; Software test controller, LED display and set blowing time, range 0~99 seconds adjustable, internal use of circular involute duct, high wind speed, low noise.

1. Humanized control panel design, clear indicator light instructions, give clear air shower process instructions. Soft key touch time relay;

2. High cleanliness and high wind speed: AAF primary and filter two-stage filtration system is adopted, and there is no partition plate and low resistance filter. The filtration efficiency is 99.99, ensuring the purification level. Equipped with all stainless steel multi-angle adjustable nozzles, double volute outer rotor large air volume and low noise fan, the air speed at the air outlet of the air nozzle is as high as 25 m/s or more, and the air speed blowing to the human body is more than 18 m/s.

3. Modular structure, the air shower chamber box adopts modular design scheme, which can be assembled into air shower sizes of various lengths according to actual needs. An air shower room consists of one or more air shower units. For large-volume air shower equipment, it can be divided into multiple modules, making production, transportation and installation particularly convenient and fast.

4, high performance, high sealing: the use of imported electronic components, stable and reliable operation performance, noise reduction mute device system and the use of EVA sealing material, high sealing performance.

3. structure configuration:

1. Automatic control. The single-person single-blowing air shower room system adopts PLC intelligent control means. The LED display screen on the control panel can correctly display the running state of air shower, the interlocking state of double doors, the progress of air shower cycle and the delayed door opening state. And equipped with photoelectric sensor, one-way channel air shower room, enter from the non-clean area, after closing the door infrared sensor to blow the shower, after blowing the shower door lock, can only go out of the air shower room;

2. Single-person single-blowing air shower room main board soft key touch time relay, LED display and set the blowing time, the range is adjustable in 10-99s, and the blowing time can be adjusted according to the difference of the external environment of the air shower room;

3. Modular structure, single-person single-blowing air shower chamber box adopts modular design scheme;

4, high performance, high sealing, imported electronic components, stable and reliable operation performance, noise reduction mute device system and the use of EVA sealing material, high sealing performance.

4. acceptance method:

1. General requirements:

(1) Test environment:

The performance test shall be carried out in a laboratory meeting the following environmental requirements:

a. Temperature: 5 ℃ ~ 35 ℃;

B, relative humidity: 35% ~ 85%;

(2) Power supply:

a. Power supply voltage deviation: ± 10% of rated voltage;

B. Power frequency deviation: ± 2Hz (based on rated frequency).

2. Test instrument (air shower room circuit board)

(1) The test instrument shall be regularly sent to a measurement and testing institution with verification qualification for verification. The test instrument shall be put into use only after being verified and corrected to be qualified, and shall be used within the specified validity period.

(2) The following instruments are required for the test:

a. Particle counter (particle size resolution starts from 0.3μm);

B, hot ball anemometer, measurement error ≤ ± 3% full scale;

C, sound level meter, the measurement range should be 40 dB(A)~ 100dB(A);

d. Illumination meter, measuring range of 0 lx ~ 1000lx;

e. Leakage current measuring instrument;

f. Grounding resistance tester;

G, withstand voltage tester, the output is 50Hz, the basic sine wave 1500V voltage, and the duration can be set in the range of 1s ~ 60s.

3. Appearance requirements: The appearance shall be inspected by visual inspection.

5. use note:

Ultraviolet germicidal lamp is actually a low pressure mercury lamp. Low-pressure mercury lamp is the use of low mercury vapor pressure is activated and emit ultraviolet light, its spectral line mainly has two: one is 253.7nm wavelength; the other is 185nm wavelength, these two are invisible to the naked eye ultraviolet. Since ultraviolet rays kill cells, attention should be paid to the fact that ultraviolet rays cannot directly irradiate human skin, especially eyes, when ultraviolet germicidal lamps are lit, do not look directly at the lamp tube. As short-wave ultraviolet rays do not pass through ordinary glass, wearing glasses can avoid eye injury. Air shower room infrared automatic induction air shower room means that after the infrared sensor is cut off from the light sense at the other end, the whole intelligent circuit board system detects that people stand in the induction area and automatically start all devices, thus achieving automatic shower blowing. Therefore, it is not advisable to turn on the ultraviolet germicidal lamp for a long time when using the ultraviolet germicidal lamp in the air shower room, and set the inching switch to turn on the ultraviolet germicidal lamp to protect the operator and reduce the human body injury.

6. safety points:

The air shower room is a necessary passage for people to enter the clean room. It can reduce the pollution problems caused by entering and leaving the clean room, and reduce the large amount of dust particles caused by the entry and exit of people and goods. The installation of a fully functional "airlock" at the entrance of the clean room can reduce the number of air pollution particles. When people and goods pass through the air shower room, the pollution particles are shot out by the filtered highly clean air, the high wind speed above 25 m/s ensures that the effective jet and drift particles are basically filtered out through the primary and two-stage filters. In order to maintain the safe use of the air shower, maintain the cleanliness of the clean room environment.

1. When entering the clean and clean room, you should take off your coat in the outside dressing room and remove watches, mobile phones, accessories and other items.

2. Enter the internal dressing room and wear clean clothes, caps, masks and gloves.

3. After opening the stainless steel air shower door and entering the air shower room, the air shower door will automatically close the outer door immediately, infrared induction, air shower will automatically start, and blow for 15 seconds.

7. factors affecting the air in the air shower room:

1. Operators in the dust-free room shall work in strict accordance with the operating rules of the dust-free room. The doors and windows of the clean room should be closed at any time. There should be a buffer zone for the transfer of personnel and articles between the clean room and the non-clean room, and there should be wind bath equipment to prevent the convection of air flow. Personnel unrelated to production should not enter the clean room.

2. The ventilation rate of the clean room and the air supply volume of the air conditioning purification system are the main internal factors to maintain the positive pressure and cleanliness of the clean room, but it is restricted by the final resistance of the filters at all levels in the purification system.

3. The equipment in the dust-free room requires regular, regular and fixed personnel cleaning and maintenance, and whether the materials and cleaning liquids used in cleaning conform to the regulations of clean room management, etc.

4. For users, the cleanliness of the clean room is the focus of their concern. The main pollution source of the clean room in operation is people and items entering the clean room. The dust particles generated in the production are also another reason that affects the cleanliness of the room.

The reasonable diversion of people and things is of great significance to the maintenance of the cleanliness of the air shower room. Whether people change clothes and blow before entering the dust-free room, whether their clothes conform to the standards of clean management standards, and some personnel with special production processes and high requirements on cleanliness also need to bathe before entering. Whether the objects are packaged and showered before entering the dust-free room, whether the replaced materials meet the clean room standards, etc.

8. operating procedures:

1. After opening the stainless steel air shower door and entering the air shower room, the air shower door will automatically close the outer door immediately. Infrared (voice control/human body heat energy) induction will automatically start the air shower for 15 seconds (factory set). Note: The two stainless steel doors of the air shower room cannot be opened at the same time when blowing. If it is forcibly opened, the electronic lock will be damaged. The two doors of the air shower room are electronically interlocked.

2. After the air shower is finished, push the door out and enter the clean clean room.

9. installation:

When the air shower room is installed at the entrance of the clean room, there should be no gap between it and the wall panel of the clean room. If there is air leakage, please trim the edge with caulking agent and pay attention to the levelness of the equipment installation, otherwise the door opening and durability will be affected. The equipment is divided into base type and non-base type. The base type can be directly adjusted and modified with silica gel. The non-base type shall be fixed with expansion screws and then filled with silica gel. The wiring of the power supply shall be connected to the terminals R,S,T and E in the junction box above the equipment according to the voltage shown in the specifications.

10. maintenance methods:

1. Pre-filter screen (PRE-FILTER): The pre-filter screen is below the equipment. Please remove the circulating air return port to easily pull out the pre-filter screen. The blocking of the pre-filter varies depending on the frequency of use and the clean state. Please observe the blocking time at the initial stage of use, and then clean it regularly by compressed air, water washing, vacuum cleaning, etc. According to the general use of 2 to 3 times a month cleaning is necessary.

2. MAIN FILTER (MAIN FILTER) This filter is located after AIR NOZZLE. Its update period can be determined by detecting the wind speed value by anemometer (halving the wind value) or measuring the pressure difference by differential pressure meter (doubling the pressure difference value). Its detection period is about two to four times a year.

3. As the circulating return air part inside the equipment is located below the machine, large pollutants will accumulate in the corners on the bottom plate, so please clean it with a vacuum cleaner more than once a week. Please confirm whether the rotating direction of the blower is correct. If it is found that the fan rotates in the opposite direction (the wind speed is obviously insufficient), please replace any 2-phase power line in the three-phase power source to determine the positive direction rotation.

XI. Controlled Maintenance:

1, the control of the number of dust particles in the clean room, the environmental control and daily maintenance of the clean room, the air purification system plays a very key role. When the air cleanliness requirement for injection production is 100, vertical and horizontal unidirectional flow patterns are adopted, and the air velocity is greater than 0.25 m/s and 0.35 m/s respectively. When the air cleanliness requirement is 10000 and 100000, non-unidirectional flow is adopted, and the air exchange rate is greater than 25 times/hour and 15 times/hour respectively (the air exchange rate for 300000 is not less than 12 times/hour), in order to take away the dust and dust generated in the production process in time and maintain the cleanliness of the clean room environment.

Clean rooms are divided into biological clean rooms and non-biological clean rooms. The biological clean room air purification system must operate continuously; the non-biological clean room air purification system should be started 4 hours before use. Dust particle counter shall be used to detect dust particles after buffering for 0.5~1 hour after environmental sanitation and cleaning. In order to avoid man-made pollution, only two people shall be waited in the clean room during static test. Critical control points should be dynamically monitored during the production of injections. Control of microbial content. The control of the microbial content in the clean room environment is still based on a good air purification system, and its filtration efficiency can reach 99.9 to 99.99 percent to filter out bacteria and dust in the air. In the production, the temperature in the clean room is strictly controlled at 18~26 ℃ and the relative humidity is controlled at 45% ~ 65%, so as to destroy the growth conditions conducive to bacteria, and the cleaning and disinfection of disinfectant. Regarding the disinfection of daily disinfectant, after the end of daily production, wipe the machine table, desktop, doors and windows, full-automatic air shower room, purification table, clean shed, FFU fan filter unit, wall, etc. with 75% ethanol or 2 ‰ neogermin solution, and wipe and disinfect the ground with 3% ~ 5% lysol. After the end of production every 3 days, 75% ethanol or 2 ‰ of neogermin solution shall be used to wipe and disinfect the surfaces of all facilities in the clean room, ceilings, lighting and other surfaces, and 3% ~ 5% of lysol shall disinfect the ground.

Strictly controlling the pressure difference between the clean room and the adjacent room is also an important link to ensure the cleanliness of the air in the production room. The pressure difference between clean room and clean area and non-clean area of different clean levels should be greater than 5 Pa SCA, and the pressure difference between clean area and outdoor should be greater than 10 Pa SCA, and the opening and closing of air supply, return air and exhaust system flow should be interlocked and operated in sequence, so as to avoid air backflow and reduce the pollution of low-level dust to the clean room environment. Before each production and after a certain production cycle, the number of dust particles in the clean room must be detected under static conditions to evaluate and master the content of dust particles in the clean room.

The purpose of environmental control and daily maintenance of the air shower room in the clean room is to kill the bacterial propagules produced in the production process and control the microbial content in the clean room. These measures can only control the amount of bacteria and miscellaneous bacteria in clean indoor air. If there is more mold, it is necessary to spray the room with 5% carbolic acid first, and then fumigate with formaldehyde to achieve sterile effect, and only in this way can bacteria and miscellaneous bacteria spores be killed. At the end of each production cycle, the clean room with aseptic requirements shall be disinfected with disinfectant before the next production cycle. After the number of dust particles in the clean room is detected to meet the requirements, the clean room shall be fumigated with formaldehyde gas. From the long-term detection results, this environmental sterilization method has good effect.

5. Formaldehyde gas sterilization technology. Formaldehyde fumigation not only has a good sterilization effect on the mold that is not easy to kill, but also has a good killing effect on the bacterial spores in the environment. Attention should be paid to the operation of formaldehyde fumigation: firstly, the room temperature should be above 35 ℃ and the relative humidity should be above 60%; Secondly, the amount of formaldehyde should be guaranteed to reach the ratio of 10g/m3 of room volume. In addition, the room disinfection time should not be less than 12 hours. It is especially worth reminding that the same proportion of ammonia water is used for neutralization before formaldehyde replacement, which will greatly reduce the harm to human body and environmental pollution. In order to prevent bacteria from being resistant to formaldehyde, ozone can be used to alternate the effect will be better.

6, reduce the impact of people on the sterile environment.

7. People are the main source of pollution in the aseptic environment. Therefore, the number of people working in the clean area and the number of people working in the operating room, the amplitude of the operation and the style, texture and wearing of the work clothes have a significant impact on the content of particles and bacteria.

Twelve, nine major maintenance:

1, the regular use of instruments to determine the technical indicators of the equipment, such as does not meet the requirements of technical parameters should be dealt with in a timely manner.

2. According to the actual use, regularly remove the filter material in the primary air filter for cleaning.

3. When the wind speed is found to be small, first check whether the surface of the primary air filter is black. If it is black, it means that the pre-filter contains more dust and the resistance increases, that is, the non-woven fabric in the primary air filter should be removed for cleaning or replacement.

4. When the non-woven fabric is replaced or cleaned, the wind speed still cannot be increased, indicating that the air filter has been blocked, causing increased resistance, and the air filter should be replaced.

5. When replacing the filter, remove the spray ball plate, remove the filter, and replace the new air filter according to the specifications and models of the original filter. When installing, confirm the arrow mark on the filter, and the arrow should point in the direction of the air flow. And ensure that the seal is good to prevent leakage.

6. After the filter is replaced, it is necessary to confirm that there is no leakage in the frame, and detect it with a dust particle counter, and normal work can only be carried out after reaching the technical indicators.

7, regular maintenance of electrical lines, if there is a fault can refer to the electrical schematic diagram for maintenance.

8. Enclose the door regularly to align the electronic lock with its lock hole to avoid the lock pin from being stuck.

9, the use temperature shall not exceed 50 ℃, and it is strictly prohibited to use open flame.

XIII. Blow and shower system:

Generally speaking, the principle of infrared automatic induction blowing system in air shower room can be divided into two categories. One category is simply the photoelectric effect of semiconductor materials. For example, when infrared radiation enters a semiconductor PN junction, it will cause the excitation of local carriers in the semiconductor, and the migration of electrons and holes will be generated under the action of the electric field built in the PN junction. If wires are added to both ends of the PN junction and a load, the voltage change can be measured at both ends of the load, in order to achieve the purpose of infrared sensing.

This category is called photon infrared detection (induction), knowing that infrared radiation must be accompanied by thermal effects, when some objects absorb infrared radiation will cause changes in the temperature of the object. The principle of the second type of infrared induction is to use infrared radiation to cause the temperature change of the object to design, called thermal infrared detection.

The entire intelligent circuit board system of the automatic sensing system detects that people stand in the sensing area and automatically start all devices, so as to achieve automatic blowing and showering. The automatic door induction system of the non-automatic door air shower room referred to above.

Work flow of infrared automatic induction blowing system in air shower room: generally, when people enter the blowing area of air shower room, the system will automatically sense blowing. After the infrared automatic induction blowing, the fan introduces air from the outside into the static pressure box of the air shower chamber by the centrifugal fan after passing through the primary filter, and then the clean air filtered by the filter is sprayed at high speed from the nozzle of the air shower chamber to achieve the purpose of air shower chamber purification.

Fourteen, common fault pole fault disposal:

Common faults:

1. Power switch, usually there are four places in the air shower room to cut off the power:

(1) The power switch of the outer box of the air shower room;

(2) The control panel of the box body in the air shower room;

(3) on the outer box on both sides of the air shower room (the power switch here can prevent the power from being cut off in an emergency, effectively improving our personal safety). When the power indicator is not working, do not recheck the power supply of the above four air showers.

2. When the fan of the air shower room does not work, first check whether the emergency switch of the outer box of the air shower room is cut off. If it is determined that it is cut off, press it gently with your hand and rotate it to the right to let go.

3. If the fan in the air shower room is reversed or the wind speed in the air shower room is very small, please be sure to check whether the 380V three-phase four-wire line is connected in reverse. Generally, a specially assigned electrician will connect the line when leaving the factory. If the line source of the air shower room is reversed, the lighter will cause the air shower room fan to not work or the wind speed of the air shower room will decrease, and the heavier will burn the circuit board of the whole air shower room. We should not change.

4. The air shower room does not blow shower. In addition to the above three points, it is also necessary to check whether the emergency stop key inside the air shower room box is pressed. If the emergency stop key is meridian color, the air shower room will not blow shower. Press the emergency stop button again to work normally.

5. When the air shower room cannot automatically sense the shower, check the light sensing system in the lower right corner of the box body in the air shower room to see if the light sensing device is installed correctly. If the two sides of the light sensing are opposite and the light sensing is normal, the shower can be automatically sensed.

6. When the wind speed of the air shower room is very low for a period of time, please check whether the initial and filter of the air shower room have accumulated too much dust. If so, please replace the filter. (The initial filter of the air shower room is generally replaced once within 1-6 months, and the filter of the air shower room is generally replaced once within 6-12 months).

Fault handling:

1. When the air shower room is used for a period of time, if the wind speed is very low, check immediately whether the filter of the air shower room can accumulate too much dust, and replace the filter with a new one. Usually it is necessary to exchange once every 1-6 months, and the filter is usually exchanged once every 6-12 months.

2. If the air shower room cannot automatically sense the shower, check the light sensing system in the lower right corner of the box in the air shower room to see if the light sensing equipment is correct. If the emergency stop button is red, it means that the air shower room will not be drenched, and normal operation can be carried out only by pressing the emergency stop button from the beginning.

3. When the air shower room does not work, first check whether the urgent switch of the box outside the inferior shower door can be blocked. If it is blocked, press it quietly with your hand and rotate to the right to let go.

4. The fan in the air shower room is reversed. Perhaps the wind speed in the air shower room is very small. It is necessary to check whether the 380V three-phase four-wire line can be connected in reverse. If the line source of the air shower room is connected in reverse, the light one will cause the fan of the air shower room to not operate or reverse the wind speed of the air shower room to decrease, and the heavy one will burn the circuit board of the whole air shower room.

Fifteen, the application of the role:

The air shower room is used in various dust-free workshops, non-dust-free workshops and step cleanliness workshops such as microelectronics, optoelectronics, semiconductors, medicine, food, chemical industry, aviation, automobiles, printing, laboratories, etc. It is used to remove dust particles larger than 0.3 microns from all parts of people in the process of entering high cleanliness rooms from low cleanliness rooms, so as not to bring pollution after entering clean rooms. At the same time, it also plays a role of airflow buffering, because in the process of opening the door, there is air flow, and the air shower room is very good to stop the airflow inside the air shower room, so as to avoid the air pollution caused by the air flow.